linux-kernel - [PATCH v1] [media] uvcvideo: mark buffer error where overflow

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Message-Id: <1503040676-28802-1-git-send-email-baoyou.xie@linaro.org>
Date:   Fri, 18 Aug 2017 15:17:56 +0800
From:   Baoyou Xie <baoyou.xie@...aro.org>
To:     laurent.pinchart@...asonboard.com, mchehab@...nel.org
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        shawnguo@...nel.org, baoyou.xie@...il.com, baoyou.xie@....com.cn,
        jun.nie@...aro.org, broonie@...nel.org, arnd@...db.de,
        Baoyou Xie <baoyou.xie@...aro.org>
Subject: [PATCH v1] [media] uvcvideo: mark buffer error where overflow

Some cameras post inaccurate frame where next frame data overlap
it. this results in screen flicker, and it need to be prevented.

So this patch marks the buffer error to discard the frame where
buffer overflow.

Signed-off-by: Baoyou Xie <baoyou.xie@...aro.org>
---
 drivers/media/usb/uvc/uvc_video.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index fb86d6a..81a3530 100644
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -1077,6 +1077,7 @@ static void uvc_video_decode_data(struct uvc_streaming *stream,
 	/* Complete the current frame if the buffer size was exceeded. */
 	if (len > maxlen) {
 		uvc_trace(UVC_TRACE_FRAME, "Frame complete (overflow).\n");
+		buf->error = 1;
 		buf->state = UVC_BUF_STATE_READY;
 	}
 }
-- 
2.7.4